[Federal Register Volume 61, Number 6 (Tuesday, January 9, 1996)]
[Rules and Regulations]
[Pages 622-623]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-269]



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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39

[Docket No. 94-NM-237-AD; Amdt. 39-9468; AD 95-26-10]


Airworthiness Directives; Jetstream Model 4101 Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

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SUMMARY: This amendment supersedes an existing airworthiness directive 
(AD), applicable to certain Jetstream Model 4101 airplanes, that 
currently requires repetitive purging of the hydraulic system and 
installation of a spoiler actuator that has been previously certified. 
That AD was prompted by a report of damage to the locking mechanisms on 
some pistons of the spoiler actuators. The actions specified by the AD 
are intended to prevent uncommanded extension of the lift spoiler in 
the event of loss of hydraulic pressure in the spoiler actuator. This 
amendment establishes an increased life limit for certain spoiler 
actuators, and provides an optional terminating action for the 
requirements of that AD. This amendment also limits the applicability 
of the rule to fewer airplanes.

DATES: Effective February 8, 1996.
    The incorporation by reference of Jetstream Alert Service Bulletin 
J41-A27-034, Revision 1, dated October 28, 1994, as listed in the 
regulations, is approved by the Director of the Federal Register as of 
February 8, 1996.
    The incorporation by reference of Jetstream Alert Service Bulletin 
J41-A27-034, dated June 9, 1994, as listed in the regulations, was 
approved previously by the Director of the Federal Register as of 
September 6, 1994 (59 FR 43025, August 22, 1994).

ADDRESSES: The service information referenced in this AD may be 
obtained from Jetstream Aircraft, Inc., P.O. Box 16029, Dulles 
International Airport, Washington, DC 20041-6029. This information may 
be examined at the Federal Aviation Administration (FAA), Transport 
Airplane Directorate, Rules Docket, 1601 Lind Avenue, SW., Renton, 
Washington; or at the Office of the Federal Register, 800 North Capitol 
Street, NW., suite 700, Washington, DC.

FOR FURTHER INFORMATION CONTACT: William Schroeder, Aerospace Engineer, 
Standardization Branch, ANM-113, FAA, Transport Airplane Directorate, 
1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (206) 
227-2148; fax (206) 227-1149.

SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal 
Aviation Regulations (14 CFR part 39) by superseding AD 94-17-12, 
amendment 39-9007 (59 FR 43025, August 22, 1994), which is applicable 
to certain Jetstream Model 4101 airplanes, was published in the Federal 
Register on September 8, 1995 (60 FR 46792). The action proposed to 
continue to require repetitive purging of the hydraulic system and 
installation of an actuator that has been previously certified marked 
with an ``R'' after the serial number. The action also proposed to 
establish an increased life limit for certain spoiler actuators, and 
provide an optional terminating action for the requirements of the AD. 
Additionally, the action proposed to limit the applicability of the 
rule to fewer airplanes.
    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. Due consideration has been given to 
the single comment received.
    The commenter supports the proposed rule.
    After careful review of the available data, including the comment 
noted above, the FAA has determined that air safety and the public 
interest require the adoption of the rule as proposed.
    The FAA estimates that approximately 17 airplanes of U.S. registry 
will be affected by this AD.
    The repetitive purging and installation actions that are currently 
required by AD 94-17-12 take approximately 6 work hours per airplane to 
accomplish, at an average labor rate of $60 per work hour. Based on 
these figures, the cost impact on U.S. operators of the actions 
currently required is estimated to be $6,120, or $360 per airplane.
    Replacement of the spoiler actuator at the newly established life 
limit will add no new costs to affected operators. In fact, it will 
reduce the economic burden for most operators, since: (1) Repetitive 
purging of the actuators will be eliminated, and (2) replacement of the 
actuators will not have to be accomplished as often as was previously 
required. Additionally, some of the replacement actuators will be 
provided to operators free of charge by the manufacturer.
    Further, since this AD is applicable to fewer airplanes than was AD 
94-17-12, the cost impact of the AD will be reduced by the amount of 
labor and parts costs that would previously have been applied to those 
additional airplanes.
    The cost impact figures discussed above are based on assumptions 
that no operator has yet accomplished any of the requirements of this 
AD action, and that no operator would accomplish those actions in the 
future if this AD were not adopted.
    The regulations adopted herein will not have substantial direct 
effects on the States, on the relationship between the national 
government and the States, or on the distribution of power and 
responsibilities among the various levels of government. Therefore, in 
accordance with Executive Order 12612, it is determined that this final 
rule does not have sufficient federalism implications to warrant the 
preparation of a Federalism Assessment.
    For the reasons discussed above, I certify that this action: (1) is 
not a ``significant regulatory action'' under Executive Order 12866; 
(2) is not a ``significant rule'' under DOT Regulatory Policies and 
Procedures (44 FR 11034, February 26, 1979); and (3) will not have a 
significant economic impact, positive or negative, on a substantial 
number of small entities under the criteria of the Regulatory 
Flexibility Act. A final evaluation has been prepared for this action 
and it is contained in the Rules Docket. A copy of it may be obtained 
from the Rules Docket at the location provided under the caption 
ADDRESSES.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

    Accordingly, pursuant to the authority delegated to me by the 
Administrator, the Federal Aviation Administration amends part 39 of 
the Federal Aviation Regulations (14 CFR part 39) as follows:

PART 39--AIRWORTHINESS DIRECTIVES

    1. The authority citation for part 39 continues to read as follows:

    Authority: 49 USC 106(g), 40101, 40113, 44701.


Sec. 39.13  [Amended]

    2. Section 39.13 is amended by removing amendment 39-9007 (59 FR 
43025, August 22, 1994), and by adding 

[[Page 623]]
a new airworthiness directive (AD), amendment 39-9468, to read as 
follows:

95-26-10 Jetstream Aircraft, Limited: Amendment 39-9468. Docket 94-
NM-237-AD. Supersedes AD 94-17-12, Amendment 39-9007.

    Applicability: Model 4101 airplanes; having constructors numbers 
41004 through 41015 inclusive, 41018 through 41026 inclusive, 41028 
through 41030 inclusive, and 41032; certificated in any category.

    Note 1: This AD applies to each airplane identified in the 
preceding applicability provision, regardless of whether it has been 
modified, altered, or repaired in the area subject to the 
requirements of this AD. For airplanes that have been modified, 
altered, or repaired so that the performance of the requirements of 
this AD is affected, the owner/operator must use the authority 
provided in paragraph (d) of this AD to request approval from the 
FAA. This approval may address either no action, if the current 
configuration eliminates the unsafe condition; or different actions 
necessary to address the unsafe condition described in this AD. Such 
a request should include an assessment of the effect of the changed 
configuration on the unsafe condition addressed by this AD. In no 
case does the presence of any modification, alteration, or repair 
remove any airplane from the applicability of this AD.

    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent uncommanded extension of the lift spoiler in the 
event of loss of hydraulic pressure in the spoiler actuator, 
accomplish the following:
    (a) Within 21 days after September 6, 1994 (the effective date 
of AD 94-17-12, amendment 39-9007), remove the spoiler actuators in 
accordance with Jetstream Alert Service Bulletin J41-A27-034, dated 
June 9, 1994, or Jetstream Alert Service Bulletin J41-A27-034, 
Revision 1, dated October 28, 1994. Following removal of the 
actuators, accomplish the requirements of paragraphs (a)(1) and 
(a)(2) of this AD, in accordance with the service bulletin. 
Thereafter, repeat the requirements of this paragraph at intervals 
not to exceed 500 landings.
    (1) Prior to further flight, purge the hydraulic system to 
ensure that there is no contamination.
    (2) Prior to further flight, install a spoiler actuator that has 
been previously certified and marked with an ``R'' after the serial 
number on the nameplate of the actuator.
    (b) For spoiler actuators having Lucas Aerospace part number (P/
N) TY1763-01A or P/N TY1763-01B: Prior to the accumulation of 5,000 
total hours time-in-service on the spoiler actuator, or within 30 
days after the effective date of this AD, whichever occurs later, 
replace the actuator with a new or serviceable part, in accordance 
with Jetstream Service Bulletin J41-A27-034, Revision 1, dated 
October 28, 1994. Thereafter, prior to the accumulation of 5,000 
hours time-in-service on the spoiler actuator, replace the actuator 
with a new or serviceable part, in accordance with the service 
bulletin. Such replacement constitutes terminating action for the 
repetitive purging and repetitive installation requirements of 
paragraph (a) of this AD.
    (c) Installation of improved spoiler actuators (Modification JM 
41381) on the left and right wings, in accordance with Jetstream 
Service Bulletin J41-27-037, dated November 7, 1994, constitutes 
terminating action for the requirements of paragraphs (a) and (b) of 
this AD.
    (d) An alternative method of compliance or adjustment of the 
compliance time that provides an acceptable level of safety may be 
used if approved by the Manager, Standardization Branch, ANM-113, 
FAA, Transport Airplane Directorate. Operators shall submit their 
requests through an appropriate FAA Principal Maintenance Inspector, 
who may add comments and then send it to the Manager, 
Standardization Branch, ANM-113.

    Note 2: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Standardization Branch, ANM-113.
    (e) Special flight permits may be issued in accordance with 
sections 21.197 and 21.199 of the Federal Aviation Regulations (14 
CFR 21.197 and 21.199) to operate the airplane to a location where 
the requirements of this AD can be accomplished.
    (f) The actions shall be done in accordance with Jetstream Alert 
Service Bulletin J41-A27-034, dated June 9, 1994, or Jetstream Alert 
Service Bulletin J41-A27-034, Revision 1, dated October 28, 1994. 
The incorporation by reference of Jetstream Alert Service Bulletin 
J41-A27-034, dated June 9, 1994, was approved previously by the 
Director of the Federal Register in accordance with 5 U.S.C. 552(a) 
and 1 CFR part 51 as of September 6, 1994 (59 FR 43025, August 22, 
1994). The incorporation by reference of Jetstream Alert Service 
Bulletin J41-A27-034, Revision 1, dated October 28, 1994, is 
approved by the Director of the Federal Register in accordance with 
5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from 
Jetstream Aircraft, Inc., P.O. Box 16029, Dulles International 
Airport, Washington, DC 20041-6029. Copies may be inspected at the 
FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, 
Washington; or at the Office of the Federal Register, 800 North 
Capitol Street, NW., suite 700, Washington, DC.
    (g) This amendment becomes effective on February 8, 1996.

    Issued in Renton, Washington, on December 18, 1995.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 96-269 Filed 1-8-96; 8:45 am]
BILLING CODE 4910-13-U